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use crate::field::codec::Codec;

pub struct ByteCodecLE;

pub struct ByteCodecBE;

impl Codec for ByteCodecLE {

    fn read(&self, buffer: &[u8]) -> u64 {

        let mut block: [u8; 8] = [0; 8];

        unsafe {

            std::ptr::copy_nonoverlapping(buffer.as_ptr(), block.as_mut_ptr(), buffer.len());

        }

        u64::from_le_bytes(block)

    }

    fn write(&self, buffer: &mut [u8], value: u64) {

        let block = value.to_le_bytes();

        unsafe {

            std::ptr::copy_nonoverlapping(block.as_ptr(), buffer.as_mut_ptr(), buffer.len());

        }

    }

}

impl Codec for ByteCodecBE {

    fn read(&self, buffer: &[u8]) -> u64 {

        let mut block: [u8; 8] = [0; 8];

        let offset = 8 - buffer.len();

        block[offset..buffer.len() + offset].copy_from_slice(buffer);

        u64::from_be_bytes(block)

    }

    fn write(&self, buffer: &mut [u8], value: u64) {

        let offset = 8 - buffer.len();

        let block = value.to_be_bytes();

        let motherfuckingrust = buffer.len();

        buffer.copy_from_slice(&block[offset..motherfuckingrust + offset]);

    }

}

#[cfg(test)]

mod tests {

    use crate::field::codec::bytes::ByteCodecLE;

    use crate::field::codec::Codec;

    #[test]

    fn basic() {

        let buffer = [0xFF, 0xFF, 0xFF, 0xFF];

        assert_eq!(ByteCodecLE.read(&buffer[0..4]), 0xFFFFFFFF);

    }

    #[test]

    fn other() {

        let mut buffer = [0, 0, 0, 0];

        ByteCodecLE.write(&mut buffer[0..1], 128);

        assert_eq!(ByteCodecLE.read(&buffer[0..1]), 128);

        ByteCodecLE.write(&mut buffer[1..3], 4242);

        assert_eq!(ByteCodecLE.read(&buffer[1..3]), 4242);

    }

}